Liquid spray unit, method for spraying liquid using it, and chemical

ABSTRACT

A liquid spray unit which can impart liquid (treating liquid, medicine, or the like) surely to a traveling body even in a high speed paper making machine. The liquid spray unit for spraying liquid to a traveling body comprises a spray tube provided with a nozzle for spraying liquid, and an air box provided with an opening for jetting an air flow, wherein the spray tube and the air box are arranged such that the air flow is jetted from the air jet opening toward the liquid sprayed from the spray nozzle and the sprayed liquid can be blown to the traveling body after being accelerated by the air flow. The liquid can be sprayed more effectively to the traveling body by making compact the unit depending on the quantity of liquid being imparted or the inner space of a paper making machine, or the like, or by employing a unit of a type of reciprocating a single nozzle.

TECHNICAL FIELD Technical Field Pertinent to the Invention

The present invention relates to a liquid spray unit applied to anobject traveling at high speed, and more particularly, to a liquid sprayapplication unit for securely applying liquid to paper moving at highspeed by a paper making machine or the like, kinds of rolls such as adrier roll, a press roll and the like in the paper making machine or thelike, and members such as a canvas, wire or the like.

BACKGROUND ART Prior Art

In conventional, in order to increase paper strength, make multi-layerpaperboard and the like, liquid such as paper strength increasing agent,interlayer adhesive agent or the like is applied to the paper movinginside the paper making machine.

Further, for the purpose of preventing foreign materials caused by pulpraw materials from being transferred from the paper and improving onpaper release, the chemical such as antipollution agent, mold releasingagent or the like is applied to the member such as the wire, the felt,the drier roll, the canvas or the like of the paper making machine.

In recent years, in particular, recycling of used paper or the likebecomes popular, necessity of spraying the paper strength increasingagent or the like has been increased.

Further, the higher compounding ratio of the used paper is, the more theforeign material such as gum pitch of hot melt system, or carbon-vinylacetate system caused by the used paper pulp (DIP) and the like broughtin raw material is increased. Accordingly, soils to the members such asthe wire, the felt, the drier roll, the canvas and the like increase, asa result, it's caused product defects and low runability.

Therefore, it is indispensable to apply a cleaning agent, pitch controlagent, the antipollution agent, the mold releasing agent and the like tothe members.

The various kinds of liquid mentioned above is generally sprayed andapplied from the nozzle in a state in which the paper making machine isoperated, that is, to the rolls such as the rotatable drier roll or thelike, the canvas, the wire or the like which circulate inside the papermaking machine, or the paper which is conveyed by these members andmoves inside the paper making machine (in this present specification,the rotating, circulating or moving paper and members are genericallycalled as a traveling body).

However, since an air flow (hereinafter, refer to as a surface current)is generated along the movement near a surface of the traveling bodymoving at high speed, there is generated a phenomenon that the liquidsprayed to the traveling body is rolled up to a downstream side.

An applying amount of the liquid to the paper or the like is reduced atan amount that the liquid is rolled up on the basis of the phenomenonmentioned above, and the yield ratio is deteriorated.

Further, the rolled-up liquid is attached to a frame, a hood or the likeso as to contaminate the paper making machine, and is condensed on asurface of the hood or the like so as to come down on the paper, therebygenerating a trouble such as to lower quality of paper products.

As a unit for preventing the liquid from being rolled up, the inventorof the present invention has already proposed a fluid spraying fluidsprash preventing unit (refer to Japanese Unexamined Utility ModelPublication No. 1-152762) in which an air curtain is formed in anupstream side and a downstream side of a spraying nozzle of the liquid(fluid), and the liquid is sprayed in space therebetween (refer to FIG.10).

This unit 100 intends to obtain stable spraying of liquid 101 applied toa traveling body 105 by shielding a surface current near a surface ofthe traveling body 105 (in this case, the forward moving direction isthe direction shown by an arrow 104) by means of two front and rear aircurtains 103 of an injection nozzle 102.

In accordance with the unit mentioned above, in the conventional papermaking machine in which paper making speed is comparatively low, themost liquid 101 reaches the traveling body 105, and it is possible tosolve the problem mentioned above.

However, the paper making speed of the paper making machine is recentlyvery high, and there appears a paper making machine having paper makingspeed of 1500 m/min or 2000 m/min.

In the paper making machine having very high speed, the surface currentin the periphery of the traveling body 105 such as the paper, the drierroll, the canvas and the like becomes extremely strong in accordancewith wind speed and wind pressure.

Under the extremely strong wind speed and wind pressure of the surfacecurrent as mentioned above, the surface current can not be necessarilysufficiently shielded by the air curtain of the unit mentioned above.

Accordingly, the surface current in the periphery of the traveling bodyis rather disturbed largely by the air curtain so as to generate airturbulence.

When the liquid is sprayed in the state mentioned above, there is a casethat a problem that the liquid is rather rolled up violently to thedownstream side is generated.

As mentioned above, because of appearance of the paper making machinehaving very high speed, in the unit employing the technique of shieldingthe surface current as mentioned above, it becomes hard to achieve thestable spraying of the liquid to the traveling body.

However, for the meantime, in view of recycle or the like, there is atendency that a compounding ratio of the used paper or the like withrespect to the paper raw material is increased for the future.

Accordingly, a more severe request is applied to intension of the paperstrength, prevention of foreign materials from being transferred to themember (contamination prevention), improvement of a paper release fromthe member, and the like, and a chance of applying the liquid to thepaper or the member of the paper making machine is increased.

Accordingly, even in the paper making machine having very high speed asmentioned above, there is required a spray unit which can securely applythe liquid to the traveling body such as the paper, the member or thelike.

Problem to be Solved by the Invention

The present invention is made for the purpose of solving the problemmentioned above, on the basis of the background mentioned above.

In other words, an object of the present invention is to provide aliquid spray unit which can securely apply liquid (processing solution,medical agent or the like) to a traveling body even in a paper makingmachine having very high speed.

DISCLOSURE OF THE INVENTION Means for Solving the Problem

Accordingly, as a result of devoting themselves to carry on a study onthe purpose and background mentioned above, the inventors of the presentinvention have found a matter that it is possible to apply the liquidsecurely and in a state in which a roll-up to a downstream side isinhibited even in a surface current having great wind speed and windpressure, by spraying the liquid which is once sprayed from a spraynozzle to the traveling body after being got on a high speed air flowinjected from the other air flow injection port, and have completed thepresent invention on the basis of the knowledge.

In other words, in accordance with the present invention, there isprovided (1) a liquid spray unit for spraying and applying liquid to atraveling body, comprising:

a spray nozzle for spraying the liquid; and

an air flow injecting port for injecting an air flow,

wherein the spray nozzle and the air flow injecting port are arrangedsuch as to inject the air flow to the liquid sprayed from the spraynozzle, from the air injecting port, and accelerate the sprayed liquidby the air flow so as to spray to the traveling body.

Further, there is provided (2) a liquid spray unit for spraying andapplying liquid to a traveling body, comprising:

a spray tube provided with a spray nozzle for spraying the liquid; and

an air box provided with an air flow injecting port for injecting an airflow,

wherein the spray tube and the air box are arranged such as to injectthe air flow to the liquid sprayed from the spray nozzle, from the airinjecting port, and accelerate the sprayed liquid by the air flow so asto spray to the traveling body.

Further, there is provided (3) a liquid spray unit, wherein the air boxis provided with an outer wall and an air pipe mounted inside the outerwall via a support piece.

Further, there is provided (4) a liquid spray unit, wherein the air pipeis structured such that a plurality of through holes are formed atopposite positions to the air flow injecting port provided in the outerwall in the tube wall.

Further, there is provided (5) a liquid spray unit, wherein the spraytube is provided with a plurality of spray nozzles which are arranged inparallel at a fixed interval in a width direction of the traveling body.

Further, there is provided (6) a liquid spray unit, wherein the spraytube is provided with a liquid feeding tube for feeding the liquid tothe spray nozzle, an air feeding tube for feeding compressed air, and apressure regulating tube for uniformizing pressure of the compressed airinside the air feeding tube.

Further, there is provided (7) a liquid spray unit, wherein the spraytube is provided with a pressure regulating tube for uniformizingpressure of the liquid inside the liquid feeding tube.

Further, there is provided (8) a liquid spray unit, wherein the spraytube is fixed to the air box at an interval.

Further, there is provided (9) a liquid spray unit, wherein the spraynozzle has a flat spray pattern and is fixed to the spray tube in astate of being inclined with each other.

Further, there is provided (10) a liquid spray unit, wherein the spraytube is fixed by being fitted to the air box.

Further, there is provided (11) a liquid spray unit, wherein the spraytube is provided with one spray nozzle, and sprays and applies theliquid while reciprocating in a width direction of the traveling body.

Further, there is provided (12) a liquid spray unit, wherein thetraveling body is constituted by the paper moving in a paper makingmachine or a processing machine.

Further, there is provided (13) a liquid spray unit, wherein thetraveling body is constituted by a member rotating or circulating insidea paper making machine or a processing machine.

Further, there is provided (14) a liquid spray method of spraying andapplying a liquid to a traveling body by using the liquid spray unit asrecited in the item (1) mentioned above.

Further, there is provided (15) a chemical used for the liquid spraymethod as recited in the item (14) mentioned above.

Further, there is provided (16) a chemical, wherein the chemical isconstituted by a combination of one or two of an antipollution agent, adusting preventing agent, a pitch control agent, a mold releasing agent,an adhesive agent, a surface correcting agent, a cleaning agent, a paperstrength intensifying agent, a size agent, a yield improving agent, awater repellent agent, an oil repellent agent, a slide preventing agent,a lubricant, a softening agent and a moistening agent.

The present invention can, of course, employ structure obtained bycombining two or more of the items (1) to (16) mentioned above, as faras the object of the present invention can be achieved.

Effect of the Invention

In accordance with the present invention, it is possible to securelyapply the liquid to the traveling body even if the speed of the papermaking machine or the like becomes very high, by injecting the air flowfrom the air flow injecting port to the liquid sprayed from the spraynozzle, and accelerating the liquid so as to spray to the travelingbody.

Further, it is possible to more effectively spray the liquid to thetraveling body, by making the unit compact in correspondence to anamount of application of the liquid and space in an inner portion of thepaper making machine or the like, and setting the structure to a type ofreciprocating a single nozzle.

BRIEF DESCRIPTION OF THE DRAWINGS

FIGS. 1(A) and 1(B) are views showing an example of structure in a widthdirection of a traveling body, in which FIG. 1(A) is a bottomelevational view and FIG. 1(B) is a cross sectional view along a lineX-X;

FIG. 2 is a schematic view showing a state in which a liquid spray unitA1 inhibits mist from soaring;

FIGS. 3(A) and 3(B) are schematic views explaining a fixed state of aspray tube and an air box, in which FIG. 3(A) shows a state in whichthey are closely fixed, and FIG. 3(B) shows a state in which they arefixed at an interval;

FIG. 4 is a view showing a method of spraying and applying liquid to thepaper by using the liquid spray unit A1;

FIG. 5 is a schematic view showing a state in which the liquid issprayed in a state of being inclined with respect to the spray tube;

FIG. 6 is a cross sectional perspective view showing a liquid spray unitA2 having more compact structure;

FIG. 7 is a schematic view showing a state in which liquid and an airflow are injected from a liquid spray unit A2;

FIG. 8 is a perspective view showing a liquid spray unit A3 which issuitable for low volume spray;

FIGS. 9(A) and 9(B) are enlarged views of a head portion of the liquidspray unit A3, in which FIG. 9A is a perspective view of the entire headportion, and FIG. 9(B) is a cross sectional view along a line Y-Y of anair box 2; and

FIG. 10 is a schematic view explaining a conventional fluid sprashpreventing unit for spraying the fluid.

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the Invention

A description will be given below of a liquid spray unit in accordancewith the present invention by listing up some preferable embodiments,with reference to the accompanying drawings.

The liquid spray unit in accordance with the present invention is mainlyprovided with a spray nozzle for spraying liquid, and an air flowinjecting port injecting an air flow for accelerating the sprayedliquid.

Further, the liquid is securely applied to a traveling body, byinjecting the air flow from the other air flow injecting port to theliquid sprayed from the spray nozzle, and accelerating the sprayedliquid on the air flow so as to spray to the traveling body.

First Embodiment

FIGS. 1A and 1B are views showing an example of structure of a liquidspray unit provided with plurality of spray nozzles in a width directionof a traveling body, in which FIG. 1A is a bottom elevational view andFIG. 1B is a cross sectional view along a line X-X.

A liquid spray unit A1 of this type is provided with a spray tube 1 andan air box 2.

The spray tube 1 is provided with plurality of spray nozzles 11 whichare arranged in parallel at a fixed interval.

In the present structural example, since a binary fluid nozzle is usedas the spray nozzle 11, the spray tube 1 is provided with a liquidfeeding pipe 12 for feeding the liquid to each of the spray nozzles 11,an air feeding tube 13 for feeding compressed air, and a pressureregulating tube 14 for uniformizing pressure of the compressed airinside the air feeding tube.

In the present structural example, the spray tube 1 is integrally formedsuch that the liquid feeding tube 12, the air feeding tube 13 and thepressure regulating tube 14 which are formed in a flat rectangular crosssectional shape are overlapped and welded.

The liquid feeding tube 12 and the air feeding tube 13 are respectivelycommunicated with a liquid supply tube 31 and an air supply tube 32 by aliquid injection port 15 and an air injection port 16 which are formedat one terminal end of the spray tube 1, and are supplied the liquid andthe air from a chemical tank and a compressor or the like (not shown) inan external portion.

The injection nozzle 11 is screwed with the spray tube 1 in such amanner that an intake port in a bottom portion thereof is open to theair feeding tube 13, and a liquid suction port in a side surface thereofis open to the liquid feeding tube 12, respectively.

When spraying the liquid L from plurality of spray nozzles 11 all atonce under the state mentioned above, the pressure of the compressed airinside the air feeding tube 13 generates a pressure gradient in adirection of entire length of the spray tube 1.

In other words, so-called pressure loss is generated in a terminal endside in a direction of entire length of the air feeding tube 13 (anopposite end side to the air injection port 16), and a spray amount ofthe liquid L is lowered.

In order to avoid the disadvantage mentioned above, in the spray tube 1in accordance with the present structural example, some holes 17 areprovided in a penetrating manner at some positions on a partition wallbetween the air feeding tube 13 and the pressure regulating tube 14.

Autonomous pressure regulation is executed such that the air iscommunicated between the air feeding tube 13 and the pressure regulatingtube 14 via the holes 17 and the pressure of the compressed air insidethe air feeding tube 13 becomes as uniform as possible in the directionof the entire length, that is, the spray amount of the liquid L becomesapproximately constant in all the spray nozzles 11.

As mentioned above, the pressure regulating tube 14 is provided so as touniformize the pressure of the compressed air in the air feeding tube13.

Accordingly, the spray tube 1 may be mounted to the side surfaces of theliquid feeding tube 12 and the air feeding tube 13 which are overlapped.

Further, in the case that it is necessary to uniformize the pressure ofthe liquid inside the liquid feeding tube 12, for example, it ispreferable to attach a pressure regulating tube for the liquid feedingtube to an opposite side surface to the pressure regulating tube for theair feeding tube attached to the side surfaces of the liquid feedingtube 12 and the air feeding tube 13 mentioned above.

The air box 2 is provided with an outer wall 21, and an air pipe 22 forfeeding a compressed air for an injection air flow to an inner portion.

The outer wall 21 is constituted by a tubular structure body having arectangular cross sectional shape in the present structural example, andplurality of holes are passed through one ridge line so as to form anair flow injection port 23.

The air pipe 22 is attached to an inner portion of the outer wall 21 viaa plurality of support pieces 24, and space 25 is continuously formedbetween the outer wall 21 and the air pipe 22.

Plurality of penetrating holes 26 are formed at an opposite position tothe air flow injection port 23 in a tube wall of the air pipe 22.

A mounting pipe 34 is attached to the air box 2 via a flange 33, and amounting pipe 34 doubling as an air supply tube and the air pipe 22 ofthe air box 2 are connected on the basis of the attachment.

A compressed air is fed to the air pipe 22 from a blower or the like(not shown) in an external portion via the mounting pipe 34 (the airsupply tube).

When the compressed air is injected to the air pipe 22 of the air box 2formed in the manner mentioned above, an air flow B is injected from theair injection port 23.

In the present structure example, since the holes 26 are formed in theopposite side to the air flow injection port 23 as mentioned above, thecompressed air is injected out from the holes 26 so as to move in thespace 25 toward the air flow injection port 23 (refer to an arrow inFIG. 1B).

In the mean while, the compressed air moves in a direction of entirelength of the air box 2, that is, a direction of a terminal end side,inside the space 25.

The pressure of the compressed air is regulated inside the air box inthe manner mentioned above, whereby it is possible to make an injectionamount and injection speed of the air flow B from all the air flowinjection ports 23 in the air box 2 uniform and constant.

In this case, if necessary, the compressed air is appropriately injectedinto the air pipe 22 from an mounting pipe 34 a in an opposite end tothe mounting pipe 34.

The spray tube 1 is fitted and fixed to plurality of holders 4 attachedto the outer wall 21 of the air box 2.

At this time, a position of the spray tube 1 is fixed to the air box 2,in such a manner that a nozzle port 11 a of the spray nozzle 11 isdirected to the air flow injection port 23 of the air box 2, that is,the liquid L sprayed from the nozzle port 11 a gets on the air flow Binjected from the air flow injection port 23, as shown in FIG. 1B.

In this case, in accordance with the liquid spray unit A1 in which eachof the members is arranged as mentioned above, the air flow B isinjected from the air flow injection port 23 to the liquid L sprayedfrom the nozzle port 11 a of the spray nozzle 11.

In accordance with the operation mentioned above, the liquid L isaccelerated by the air flow B having high flow speed, and is sprayed andapplied to the surface of the traveling body with greater momentum.

In the paper making machine or the like, in order to avoid a defect indry of the paper and an excess attaching of medical agent, an amount ofthe liquid (an antipollution agent, a mold releasing agent or the like)sprayed to the traveling body is normally restricted to a small amount.

Accordingly, the spray nozzle 11 frequently employs the binary fluidnozzle which is suitable for low volume spray and can be easilyregulated at a spray amount.

However, the liquid sprayed by the binary fluid nozzle generally hasweak impact (momentum) at a time when the fluid reaches the travelingbody in comparison with the case of a single fluid nozzle suitable for alarge amount of spray, and is easily rolled up to a downstream side by asurface current of the traveling body.

In accordance with the liquid spray-unit A1 of the present invention, itis possible to accelerate the spray liquid L originally having only theweak impact (small momentum) by the air flow B so as to apply greatimpact (an accerlerating effect).

Accordingly, even in the case that the nozzle which can not beconventionally used in the very high speed paper making machine or thelike due to the too weak impact is used in the liquid spray unit inaccordance with the present invention, the liquid can securely reach thetraveling body without being rolled up.

Further, in the case of spraying the liquid by the spray nozzle, thereis a case that the liquid mist soars in the periphery of the spraypattern.

However, if the liquid spray unit A1 in accordance with the presentinvention is used, it is possible to prevent the mist from soaring.

FIG. 2 is a schematic view showing a state in which the liquid sprayunit A1 prevents the mist from soaring.

As mentioned above, the air flow B effectively captures even the mist mwhich is going to break away from a spray pattern of the liquid Lsprayed from the spray nozzle so as to roll up, and accelerates the mistm so as to spray onto the surface of the traveling body R.

Accordingly, it is possible to approximately completely inhibit theliquid L (including the liquid mist m) from being rolled up, and it ispossible to effectively apply approximately all the amount of the liquidL to the traveling body R.

In this connection, the description is mainly given of the case that thespray nozzle 11 is constituted by the binary fluid nozzle, however, itis of course possible to use the single fluid nozzle as the spray nozzle11. In this case, the same accelerating effect as the case of the binaryfluid nozzle mentioned above can be achieved.

Further, it is not necessary that the spray nozzle 11 has a specialspecification, and the spray nozzle 11 may be appropriately selectedfrom the normal single fluid nozzle and the binary fluid nozzle whiletaking the applying amount of the liquid into consideration.

It goes without saying that the structure of the spray tube 1 can beappropriately changed in correspondence to the kind and the sturcture ofthe spray nozzle 11 as occasion demands.

In this case, in the liquid spray unit A1 in accordance with the presentinvention, if the spray tube 1 and the air box 2 are fixed in a closelyattached state, there is a case that the spray tube 1, the air box 2 andthe like are contaminated by the liquid L (refer to FIG. 3(A)).

It can be considered that this matter is generated because both theelements are closely attached and fixed, whereby an accompanying airflow T of the air flow B becomes turbulent and weak in the spray tubeside (refer to a dotted arrow T in FIG. 3A), and a part of the mist mcomes to the spray tube 1 and the air box 2.

On the other hand, in the case that the spray tube 1 and the air box 2are fixed at a certain interval as shown in FIG. 3(B), the accompanyingair flow T1 can flow between both the elements, so that it is possibleto inhibit the mist m from being attached.

In accordance with experiments, it has been known that the accompanyingair flow T1 can flow effectively by setting the interval between boththe elements to 2 mm or more, and it is possible to effectively inhibitthe mist m from being attached.

FIG. 4 shows a state in which the liquid is sprayed and applied to thepaper by using the liquid spray unit A1 in accordance with the presentstructural example (the unit A is actually longer in most cases).

Since the liquid L is accelerated by the air flow injected from the airflow injection port 23 so as to change a forward moving direction, afterbeing sprayed from the spray nozzle 11 of the spray tube 1, the liquid Lis sprayed and applied to the traveling body R while drawing a locuswhich is shown to be bent in the middle.

At this time, it is preferable that the spray nozzle 11 employs a nozzlein which a spray pattern is flat (fan shape), and is fixed in a state ofbeing inclined to the spray tube 1 as shown in FIG. 5, such as toprevent the liquids L sprayed from the adjacent spray nozzles from beingcollided with each other.

In accordance with the experiments, in the case that a spray angle (θ inFIG. 5) of the liquid L with respect to a center in the longitudinaldirection of the spray tube 1 is inclined at about 15° degree, it isknown that it is possible to avoid the collision between the liquids Lso as to uniformly spray and apply the liquid to the traveling body.

Just for reference, a characteristic of a liquid spray method forspraying and applying the liquid L to the traveling body R by using theliquid spray unit A1 exists in a point that the air flow is injectedfrom the air injection port 23 to the liquid L sprayed from the spraynozzle 11, and the sprayed liquid L is accelerated by the air flow andsprayed to the traveling body R, as shown in FIG. 4.

As shown in the drawing, the spray tube 1 of the liquid spray unit A1 inaccordance with the present structure example is provided with pluralityof spray nozzles 11 which are arranged in parallel at a fixed intervalin a width direction of the traveling body R (the paper in thisexample).

Accordingly, the unit A1 is suitable for a case that a comparativelylarge amount of liquid L (that is, chemical) is sprayed and applied toan entire surface of the traveling body R.

The liquid spray method mentioned above can be used in the case ofspraying and applying the antipollution agent, the mold releasing agent,the cleaning agent or the like to the canvas, the press roll, the wire,the felt or the like, as mentioned above.

Even in the case that the mold releasing agent, the adhesive agent orthe like is sprayed and applied to the Yankee drier, the function can beeffectively achieved.

Further, it is of course possible to spray the pitch control agent tothe wire, the felt, the press roll or the like.

In accordance with the present invention, it is possible to effectivelyspray and apply the chemical to the paper traveling at high speed.

For example, it is possible to directly spray and apply the pitchcontrol agent mentioned above to the paper.

Further, it is possible to effectively spray and apply the chemical suchas a paper strength increasing agent, a size agent, a yield improvingagent or the like to the paper by a wire part, a press part or the likeof the paper making machine.

It is suitable for spraying and applying an interlayer adhesive agent tothe paper moving inside the paper making machine for making paper suchas multi-layer boardpaper or the like.

On the other hand, it is possible to spray a wax lubricant to the roll,for example, in a corrugating machine so as to apply to corrugatingmedium base paper via the roll, in addition to the paper making machine,or it is possible to apply a water repellent agent, an oil repellentagent, a slide preventing agent, an antistatic agent or the like to aliner via the roll or the like.

Further, the present invention can be used even in the case that asoftening agent, a moistening agent, anti-fungus agent, an aromachemical, a dye stuff, pigment, moisture content, or the like to thepaper in the paper processing machine or a humidifier.

Further, the liquid spray unit can effectively achieve the function evenin the case that the liquid such as the medical agent or the like issprayed to a half-finished product traveling inside a manufacturing unitfor various products such as a semiconductor manufacturing unit or thelike, the case that a paint is sprayed to a traveling subject, or thelike.

Second Embodiment

As mentioned above, the speed of the paper making machine or the likebecomes higher and higher in recent years, however, there is a tendencythat the entire unit becomes compact and the interval between themembers and the paper becomes narrow.

Accordingly, there is a case that it is necessary to make the liquidspray unit more compact.

FIG. 6 is a cross sectional perspective view showing a liquid spray unitwhich is made more compact.

The liquid spray unit A2 is formed as compact structure by employingstructure obtained by fitting and fixing the spray tube 1 to the air box2.

The spray tube 1 has the same structure as the spray tube 1 of the unitA1 mentioned above, and is designed such as to employ the structure usedin the unit A1 as it is.

The air box 2 is provided, in the same manner as the unit A1, an outerwall 21 and an air pipe 22 in an inner portion thereof. The air pipe 22is fixed to an inner wall of the outer wall 21 via a support piece 24,and space 25 is continuously formed between the outer wall 21 and theair pipe 22.

Further, plurality of through holes 26 are formed at opposite positionsto an air flow injection port 23 in a tube wall of the air pipe 22.

In the present structural example, the structure is made such that theouter wall 21 is folded back for the purpose of fitting the spray tube1, however, the air flow injection port 23 is formed by notching aportion near the fold back portion.

Accordingly, two rows of air flow injection ports 23 are formed inparallel so as to pinch front and rear sides of the spray nozzle 11.

FIG. 7 is a schematic view showing a state in which the liquid and theair flow are injected from the liquid spray unit A2.

As mentioned above, the liquid L sprayed from the spray nozzle 11 of theunit A2 gets on two air flows B injected from the air flow injectionport 23, and is accelerated so as to be securely sprayed and applied tothe traveling body R.

In this connection, the air flow injection port 23 may be of courseformed only in one side of the spray nozzle 11 in place of both sidesthereof, or the structure may be appropriately made such that the airflow injection port 23 may be formed in both sides of the injectionnozzle 11 and only one side is used while the other side is closed asoccasion demands.

Third Embodiment

The paper just after being conveyed to the dry part of the paper makingmachine contains a comparatively large amount of moisture content, and agum pitch, talc, a micro fiber or the like tends to be transferred fromthe paper to the drier roll.

Accordingly, in the case of spraying the antipollution agent, the moldreleasing agent or the like containing the wax or the like to the drierroll, if it is sprayed too much, there is a case that the paper isadversely affected inversely.

As mentioned above, a small amount (micro amount) of liquid spray isfrequently requested in the liquid application to the paper makingmachine or the like.

FIG. 8 is a perspective view showing a liquid spray unit A3 which issuitable for the small amount of liquid spray mentioned above.

The liquid spray unit A3 is structured such that the head portion 5including the spray tube 1 sprays the liquid while reciprocating in thewidth direction of the traveling body, and sprays and applies the liquidto the traveling body.

A description will be given first of the head portion 5 of the liquidspray unit A3.

FIGS. 9(A) and 9(B) are views enlarging the head portion of the liquidspray unit, in which FIG. 9(A) is a perspective view of the entire headportion, and FIG. 9(B) is a cross sectional view along a line Y-Y of theair box 2 (an arrow in the figure shows a flow of the compressed air).

The head portion 5 is constituted by the spray tube 1 and the air box 2in the same manner as mentioned above, however, the spray tube 1 isdifferent in a point that the spray tube 1 is provided with only onespray nozzle 11.

In the present structural example, since the spray nozzle 11 employs thebinary fluid nozzle suitable for the small amount of liquid spray, thespray tube 1 is provided with a liquid injection port 15 and an airinjection port 16.

The spray tube 1 is fitted and fixed to the air box 2.

The compressed air is injected to the air box 2 via an air injectionport 27, and the compressed air fills in space 28 and is injected fromthe air flow injection port 23 through a hole 29.

In the same manner as the case of the unit A2 shown in FIG. 7, theliquid L sprayed from the spray nozzle 11 gets on two air flows Binjected from the air flow injection port 23, and is accelerated so asto be securely sprayed and applied to the traveling body. This mattercan be easily understood from FIG. 8(B).

Next, a description will be given of the liquid spray unit A3 providedwith the head portion 5 mentioned above.

As shown in FIG. 8, the liquid spray unit A3 is constituted by a movingbelt 61, a drive motor 62 or the like in addition to the head portion 5mentioned above.

The moving belt 61 is provided in a tensional manner between a rollerrotated by the drive motor 62 and an opposite end roller (both not beingillustrated), and reciprocates between two box portions 63 and 63 a.

A base portion 51 of the head portion 5 is fixed to the moving belt 6,moves in correspondence to a reciprocating movement of the moving belt6, and reciprocates the head portion 5 in a longitudinal direction ofthe liquid spray unit A3.

An air supply tube 52, a liquid supply tube 31 and a gas supply tube 32are provided so as to stand up from the base portion 51, and arerespectively connected to an air injection port 27, a liquid injectionport 15 and a gas injection port 16 of the head portion 5 (refer to FIG.9).

The air supply tube 52, the liquid supply tube 31 and the gas supplytube 32 are bundled in a lower side of the base portion 51, are insertedthrough a cable bear 64 and are connected to a chemical tank, acompressor or the like (not shown) in an external portion of the unit.

The air supply tube 52 and the like supply the liquid and the gas (air)to the head portion 5 while being protected by the cable bear 64 whichflexibly changes a shape thereof in correspondence to motions of thehead portion 51, even if the head portion 51 moves in correspondence toa reciprocating movement of the moving belt 61.

In this case, a description will be given below of a liquid spray methodfor spraying and applying the liquid to the traveling body by using theliquid spray unit A3, on the basis of an example of a case that a microamount of antipollution agent is applied, mold releasing agent or thelike containing the wax to the drier roll of the paper making machine.

A strong surface current is generated near the surface of the drier rollon the basis of the very high speed of the paper making machine,however, in accordance with the liquid spray unit A3, it is possible tosecurely apply a micro amount of chemical (for example, spray emulsionwhich quality is 10 w/% of solid body of the wax at about 5 cc/min).

The liquid spray unit A3 is placed in the width direction of the drierroll in the same manner as the case of the unit A1 mentioned above(refer to FIG. 4).

Further, the head portion 5 sprays the chemical to the drier roll whilereciprocating at speed of about 2 m/min between two box portions 63 and63 a of the unit, and injects a strong air flow from the air flowinjection port 23 so as to accelerate the chemical and spray to thedrier roll.

The drier roll is generally heated to about 80 to 100° C., and when thechemical is applied to the surface of the drier roll, the moisture inthe chemical is evaporated, the wax is liquefied so as to make viscositysmall and be diffused on the surface, and a significantly thin oil filmis formed.

The wax is transferred to the paper little by little so as to beconsumed, however, since the chemical is appropriately supplied from thehead portion 5, an antipollution effect, a mold releasing effect or thelike can be maintained.

The liquid spray method using the liquid spray unit A3 is not limited tothe spray and application of the antipollution agent (also called as adusting preventing agent), the mold releasing agent or the like to thedrier roll as mentioned above.

For example, in the case of applying the antipollution agent or the moldreleasing agent to the canvas, it is possible to once spray and apply toa canvas roll (an out roll) by using the unit A3 so as to apply theantipollution agent or the like to the canvas via the roll.

In addition, it goes without saying that it is possible to effectivelyapply a micro amount of chemical to the member such as the paper makingmachine, the processing machine or the like, or the paper moving in thepaper making machine or the processing machine, by using the unit A3.

For example, there is a case that an extremely micro amount of surfacemodifying agent containing a solid lubricant (for example, the chemicalcontaining 1% as solid weight % of melamine cyanurate (MCA) at about 2cc/min) is applied to the Yankee drier, however, the medical agent (thechemical) is hardly rolled up even by the micro amount applicationmentioned above, so that it is possible to effectively spray and apply.

The description is given above of the present invention, however, itgoes without saying that the present invention is not limited only tothe present embodiment, but can employ various modified examples.

For example, it is of course possible to use the head portion 5 of theliquid spray unit A3 in a state in which the head portion 5 does notmove, and a plurality of head portions 5 of the unit A3 may be providedin parallel so as to be used, in place of the provision of the unit A1.

Further, for example, it is of course possible to mix two or more kindsof chemicals so as to spray, such as the paper strength increasing agentand the size agent.

Further, the other spray tube and air box than those exemplified in theunits A1, A2 and A3 can be employed as far as their functions can beachieved.

INDUSTRIAL APPLICABILITY

The present invention relates to a liquid spray unit applied to anobject traveling at high speed, and more particularly, to a liquid sprayunit for securely applying liquid to the paper moving at high speed by apaper making machine or the like, rolls such as a drier roll, a pressroll and the like in the paper making machine or the like, and memberssuch as a canvas, wire or the like, however, can be applied to the otherliquid spray unit in the other fields than the paper making technique,and the same effect can be expected as long as deviates from theprinciple.

1. A liquid spray unit for spraying and applying liquid to a travelingbody, comprising: a spray nozzle for spraying the liquid; and an airflow injecting port for injecting an air flow, wherein the spray nozzleand the air flow injecting port are arranged such as to inject the airflow to the liquid sprayed from said spray nozzle, from said airinjecting port, and accelerate the sprayed liquid by said air flow so asto spray to the traveling body.
 2. A liquid spray unit for spraying andapplying liquid to a traveling body, comprising: a spray tube providedwith a spray nozzle for spraying the liquid; and an air box providedwith an air flow injecting port for injecting an air flow, wherein thespray tube and the air box are arranged such as to inject the air flowto the liquid sprayed from said spray nozzle, from said air injectingport, and accelerate the sprayed liquid by said air flow so as to sprayto the traveling body.
 3. A liquid spray unit as claimed in claim 2,wherein said air box is provided with an outer wall and an air pipemounted inside said outer wall via a support piece.
 4. A liquid sprayunit as claimed in claim 3, wherein said air pipe is structured suchthat plurality of through holes are formed at opposite positions to theair flow injecting port provided in the outer wall in the tube wall. 5.A liquid spray unit as claimed in claim 2, wherein said spray tube isprovided with plurality of spray nozzles which are arranged in parallelat a fixed interval in a width direction of the traveling body.
 6. Aliquid spray unit as claimed in claim 5, wherein said spray tube isprovided with a liquid feeding tube for feeding the liquid to the spraynozzle, an air feeding tube for feeding compressed air, and a pressureregulating tube for uniformizing pressure of the compressed air insidesaid air feeding tube.
 7. A liquid spray unit as claimed in claim 6,wherein said spray tube is provided with a pressure regulating tube foruniformizing pressure of the liquid inside the liquid feeding tube.
 8. Aliquid spray unit as claimed in claim 2, wherein said spray tube isfixed to the air box at an interval.
 9. A liquid spray unit as claimedin claim 5, wherein said spray nozzle has a flat spray pattern and isfixed to the spray tube in a state of being inclined with each other.10. A liquid spray unit as claimed in claim 2, wherein said spray tubeis fixed by being fitted to the air box.
 11. A liquid spray unit asclaimed in claim 2, wherein said spray tube is provided with one spraynozzle, and sprays and applies the liquid while reciprocating in a widthdirection of the traveling body.
 12. A liquid spray unit as claimed inclaim 1, wherein said traveling body is constituted by the paper movingin a paper making machine or a processing machine.
 13. A liquid sprayunit as claimed in claim 1, wherein said traveling body is constitutedby a member rotating or circulating inside a paper making machine or aprocessing machine.
 14. A liquid spray method of spraying and applyingliquid to a traveling body by using the liquid spray unit as claimed inclaim
 1. 15. A chemical used for the liquid spray method as claimed inclaim
 14. 16. A chemical as claimed in claim 15, wherein said chemicalis constituted by a combination of one or two of an antipollution agent,a dusting preventing agent, a pitch control agent, a mold releasingagent, an adhesive agent, a surface correcting agent, a cleaning agent,a paper strength intensifying agent, a size agent, a yield improvingagent, a water repellent agent, an oil repellent agent, a slidepreventing agent, a lubricant, a softening agent and a moistening agent.